package com.weibo.sina;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;

import com.weibo.util.AsyncImageLoader;

import android.app.Activity;
import android.graphics.Matrix;
import android.graphics.PointF;
import android.graphics.drawable.Drawable;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.util.FloatMath;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.widget.ImageView;

public class ImageViewActivity extends Activity implements OnTouchListener {
	private static final String TAG = "Touch";
	// These matrices will be used to move and zoom image
	Matrix matrix = new Matrix();
	Matrix savedMatrix = new Matrix();
	
	private ImageView mImageView;
	private Drawable mDrawable = null;
	// We can be in one of these 3 states
	static final int NONE = 0;
	static final int DRAG = 1;
	static final int ZOOM = 2;
	int mode = NONE;

	// Remember some things for zooming
	PointF start = new PointF();
	PointF mid = new PointF();
	float oldDist = 1f;

	private Handler mHandler = new Handler() {

		@Override
		public void handleMessage(Message msg) {
			mImageView.setImageDrawable(mDrawable);
			float scale=Math.max((float)(mDrawable.getIntrinsicWidth())/(float)(mImageView.getWidth()), (float)(mDrawable.getIntrinsicHeight())/(float)(mImageView.getHeight()));
			Log.e(TAG,"scale = "+1f/scale+" width="+mImageView.getWidth()+" height="+mImageView.getHeight());
			matrix.postScale(1f/scale, 1f/scale);
			matrix.postTranslate(((mImageView.getWidth()-mDrawable.getIntrinsicWidth()/scale)/2), ((mImageView.getHeight()-mDrawable.getIntrinsicHeight()/scale)/2));
			mImageView.setImageMatrix(matrix);
			mImageView.invalidate();
			findViewById(R.id.loading).setVisibility(View.INVISIBLE);
			super.handleMessage(msg);
		}

	};

	
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.image_view);
		mImageView = (ImageView) findViewById(R.id.imageView);
		mImageView.setOnTouchListener(this);
		String url = getIntent().getStringExtra("url");
		new LoadingThread(url).start();
	}

	public boolean onTouch(View v, MotionEvent event) {
		ImageView view = (ImageView) v;

		// Dump touch event to log
		dumpEvent(event);

		// Handle touch events here...
		switch (event.getAction() & MotionEvent.ACTION_MASK) {
		case MotionEvent.ACTION_DOWN:
			savedMatrix.set(matrix);
			start.set(event.getX(), event.getY());
			Log.d(TAG, "mode=DRAG");
			mode = DRAG;
			break;
		case MotionEvent.ACTION_POINTER_DOWN:
			oldDist = spacing(event);
			Log.d(TAG, "oldDist=" + oldDist);
			if (oldDist > 10f) {
				savedMatrix.set(matrix);
				midPoint(mid, event);
				mode = ZOOM;
				Log.d(TAG, "mode=ZOOM");
			}
			break;
		case MotionEvent.ACTION_UP:
		case MotionEvent.ACTION_POINTER_UP:
			mode = NONE;
			Log.d(TAG, "mode=NONE");
			break;
		case MotionEvent.ACTION_MOVE:
			if (mode == DRAG) {
				// ...
				matrix.set(savedMatrix);
				matrix.postTranslate(event.getX() - start.x, event.getY() - start.y);
			} else if (mode == ZOOM) {
				float newDist = spacing(event);
				Log.d(TAG, "newDist=" + newDist);
				if (newDist > 10f) {
					matrix.set(savedMatrix);
					float scale = newDist / oldDist;
					Log.e(TAG, "new scale =" + scale);
					matrix.postScale(scale, scale, mid.x, mid.y);
				}
			}
			break;
		}

		view.setImageMatrix(matrix);
		return true; // indicate event was handled
	}

	/** Show an event in the LogCat view, for debugging */
	private void dumpEvent(MotionEvent event) {
		String names[] = { "DOWN", "UP", "MOVE", "CANCEL", "OUTSIDE", "POINTER_DOWN", "POINTER_UP", "7?", "8?", "9?" };
		StringBuilder sb = new StringBuilder();
		int action = event.getAction();
		int actionCode = action & MotionEvent.ACTION_MASK;
		sb.append("event ACTION_").append(names[actionCode]);
		if (actionCode == MotionEvent.ACTION_POINTER_DOWN || actionCode == MotionEvent.ACTION_POINTER_UP) {
			sb.append("(pid ").append(action >> MotionEvent.ACTION_POINTER_ID_SHIFT);
			sb.append(")");
		}
		sb.append("[");
		for (int i = 0; i < event.getPointerCount(); i++) {
			sb.append("#").append(i);
			sb.append("(pid ").append(event.getPointerId(i));
			sb.append(")=").append((int) event.getX(i));
			sb.append(",").append((int) event.getY(i));
			if (i + 1 < event.getPointerCount())
				sb.append(";");
		}
		sb.append("]");
		Log.d(TAG, sb.toString());
	}

	/** Determine the space between the first two fingers */
	private float spacing(MotionEvent event) {
		float x = event.getX(0) - event.getX(1);
		float y = event.getY(0) - event.getY(1);
		return FloatMath.sqrt(x * x + y * y);
	}

	/** Calculate the mid point of the first two fingers */
	private void midPoint(PointF point, MotionEvent event) {
		float x = event.getX(0) + event.getX(1);
		float y = event.getY(0) + event.getY(1);
		point.set(x / 2, y / 2);
	}
	
	private class LoadingThread extends Thread {
		
		String mUrl;
		
		LoadingThread(String url){
			mUrl = url;
		}

		@Override
		public void run() {
				mDrawable = AsyncImageLoader.loadImageFromUrl(getBaseContext(), mUrl);
				mHandler.obtainMessage().sendToTarget();
			super.run();
		}

	}
}
